NASA’s New Horizons spacecraft closest approach to Pluto on July 2015 looked back toward the sun and captured this near-sunset view of the rugged, icy mountains and flat ice plains extending to Pluto’s horizon.

Antennae Galaxies reloaded -- The galaxies — also known as NGC 4038 and NGC 4039 — are locked in a deadly embrace. Once normal, sedate spiral galaxies like the Milky Way, the pair have spent the past few hundred million years sparring with one another.

Photo: Resembling the puffs of smoke and sparks from a summer fireworks display in this image from NASA ESA Hubble Space Telescope, these delicate filaments are actually sheets of debris from a stellar explosion in a neighboring galaxy.